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36 Cards in this Set

  • Front
  • Back
What is the basic cause of all weather?
Sun
Scientists who study the weather are called what?
Meteorologists
What is the imaginary line running through the earth from North Pole to the South Pole?
axis
Where does the air that we live in receive most of its warmth from?
the ground
The different seasons are caused by what?
the tilt of the earth's axis
What produces winds on the earth?
temperature differences
Is warm air heavier or lighter than cool air?
lighter
How many miles per hour does the earth's surface spin?
1,000 miles per hour
The amount of water vapor that the air can hold at a given temperature is called the what of the air?
relative humidity
The lowest possible temperature at which air is able to hold all of its water vapor is called what?
dew point
The process in which water vapor leaves the air and changes into liquid water is called what?
condensation
Air is saturated when the humidity of the air is at what percent?
100%
Water vapor that condenses to form liquid water on the ground is called what?
dew
Water vapor that condenses and forms frozen water on the ground is called what?
frost
An ice crystal IN A CLOUD becomes too heavy, falls, melts, and lands on earth as liquid water.
rain
Falling ice crystals melt slightly, stick and freeze together into snowflakes.
wet snow
Falling ice crystals melt into raindrops, then refreeze and land on earth as tiny pieces of ice.
sleet
Falling ice crystals melt, hit the earth as liquid rain, but refreeze as soon as they land.
freezing rain
A small piece of ice is tossed up and down inside a cloud, forming several layers of ice, until it is too heavy and falls to earth.
hail
Puffy, bulgy clouds belong to what family?
cumulus
Layers of flat clouds belong to what family?
stratus
Wispy, curly clouds very high in the atmosphere belong to what family?
cirrus
Sheets of clouds that often produce rain are what type of clouds?
stratus
Clouds made of very small ice crystals are what type of clouds?
cirrus
"Thunderhead" is another name for what type of cloud?
cumulonimbus
A term used to describe a cloud from which rain is falling is called what?
nimbus
The broad, flat top of cumulonimbus cloud is called an _______ top.
anvil
When opposite elctrical charges build up in very tall clouds, what is produced?
lightning
The rapid expansion of superheated air causes shock waves that we hear as what?
thunder
The type of storm that packs the most destructive power into the smallest space is the what?
tornado
The calm region of very low air pressure in the center of a tornado is called what?
the eye
If a tornado has been spotted, meteorologists issue a tornado watch or warning?
warning
The safest place to be during a tornado is where?
underground
Thunderstorms usually come from which directions?
north or west
The row of thunderheads that builds up in the front of advancing cold air is called a __________ line.
squall
The boundary between two air masses is called a what?
front